Filtering apparatus



June 16, W S

' F1 AAAAAAAAAAAAAA us Filed May 23. 1 29 purposes.

so that reserve ce11s Patented June 16, 1931 UNITED STATES PATENT OFFICE WILLY SELL, 0F WINDELSBLEICHE, NEAR BIELEFLD, GEBMAN'Y, ASSIGNOR- T0 TEE FIRM K. & TE. M!LLER GESELLSCI-IAF'I." MIT BE'SCI-IRANK'IEB- HAIF'IJUNG, OF BRACK- WEDE, WESTPHALIA, GERMAN'Y FILT'ERING APPARA'IUS Application filed May 23, 1929, Serial No. 365,464, and in Germany June 5, 1928.

My invention relates to devices or apparatus for filtering air and the 1ike, and more partieularly to a filtering apparatus of the cellular end revolving types wherein a suitab1e liquid such as oil is employed for wettng In practice for instance a cellular filter of the stated kind composed of a plurality of metallic sheet members having impact and guiding faces for air and gas is dipped into the oily wetting liquid, removed from the latter end hung upon a suitable support so as to be suspended and the lquid allowed to drip oi until the sheets and the protuberances end cavities thereof are coated With a fine oi1 film only. The time required for accompishing this preparatory trea.tment o: the filter often amounts no more than 24 hours must be held in stock available end ready for use during thai; time.

Obviously the employment of filtering devices of the kind set forth is inconvenient end especially objectionable for the long periods of time required for oiling the constituent parts of the fi1ter and allowing the excess ot' oi1 to drip 011:.

The chief objeet of my nvention is 130 provide-a filtering apparatus of the eharabter referred to end equipped with metallic filtering elementsor sheets which can be used in connection with the apparatus immediately upon having been immersed into the wetting liquid and which do not entail the danger of oil being taken along with the outflowing purified air. With this and other objects in view I provide according to the resent inventi on counter-current faces on the filtering elements in sides the usual impact end guiding faces, the said counter-current faces being arrange end adapted to allow of any excess of wetting liquid to flow ofi wthin the filtering range that is in the rear of the purified air.

Conformingly in case of a cellular filter the lower frame work of the filtering apparatus must be constructed and shaped to forno a room or receptacle for collecting the wetting liqid whieh has drained from the plates, whfle in case of a rotary filter, the wtting liquil flowS into the purifying trough.

addition to or be- Wth the above recited and ancillary objects in view reference is had to the following specification end annexed drawings in which there are exhibited a few examples or embodiments of the inventon which are in no way intended as a limitation upon the scope of the subjoined claims as it is to be clearly understood that variations end modifications whioh properly full within the true scope of the said claims may be resorted '00 when found expedient. In particular the said counter-faces may be arranged and 10- cated in qute a variety of differenq ways with Figure 3 is a view similar to Figure 1 of a modified oonstructional form of the filtering sheet for use in a cellular filter,

Figure 4 is a view similar to Figure 1 of a filtering sheet for use in a rotary filter,

Figures 5 and 6 are a side view and a view in top plan respectively of a member composed of several sheets constructed or Shaped as shown in Figure 4, for use in a rotary filter,

Figures end 8 are views similar to Figures 4 and 5 respectively of a modified form 1 of the filtering sheet aud the member composed of such sheets.

In the embodiment shown in Figures 1 end 2 che metallic filterifig sheet is shaped as usua1ly to form impact end guiding faces a for the gaseous fluid and is further provided with oounter-current faces Z) for conducting the wetting liquid in countgr-current direct'ion to a collector, that is to say in si. direction opposed to the moving direction of the air or gas ourrent indicated by the arrow in Figure 2. As the air passes the impact faces 0; and comes in contact wth the counter-current fuces 6, the ol Wil1 be conducted While stili witnin the range 01' compass Of the filter, dmvnwards 01' towards 'he left band in the drawings so as to collect in the collectng receptac1e of the frame (net shown).

In the embodiment illustrated in Figure 3 supplementzuy counter-current faces c are provided between the impact and gudng faces a so that the excessive oil Will be conducted ofl' also withn the area occupied by the impact and guiding faces a whereof the contnuity is interrupted 01 dissected by the said faces o.

In the modificatien shown in Figures 4 to 6 the impact and guding faces a for air are disposed intermediate between two series of com1ter-curl'ent faces Z) for the discharge 0f e :cessve wetting liquid. The sbeet shown in Figure 4 is intended for use. in {L rotary filter end in accordance therewith provided with holes for the reception 0f suspending pins (l.

Th e embodiment shown in Figures 7 und 8 i. n-ot distnguished from thai; illustrated in tk1e Figures 4 to 6 except by the impact end guiding fuccs a dlsp0sed between the counter cmrent faCes b, being interrupted by auxiliary countercurrent fuces o, just as in the embodiment shown in Figure 3.

From the foregong it is believed that the advantnges end novel features of by invention will be readily understood and theref018 further detail description is deemed unnecessary.

VVhat I claim s:

1. A11 apparatus for filtering air comprising a number of metallic sheets composed to c0nstitute the filterng apparatus impact and gllidng faces on the said sbeets and countercurrent faces thereon for the removal of 211 excess of wetting liquid into which the apparatus is to be dipped prior to use.

2. A filtering apparatus as claimed in claim 1, wherein the counter-current faces are provided on the sheets in the rear of the impact ancl guiding faces viewed in the flow direction of the gaseous flud to be filtered.

3. A filtering apparatus as. claimed in claim 1, wherein the continuity of the mpact an& guiding faces is nterrupted by the countercurrcnt faces.

4. A filtering apparatns of the character as claimed in claim l, wherein the impact and guiding faces are disposed intermediate between the counter-current faces.

5. Ar filterng apparatus of the type including bafles coated wth a dust-collecting liquid, characterized by the fact that sad baflles include angularly-disposed portons constituting means for causing the air strea-m to take a zig-zag course, and other portions constituting means for directing the air stream upwardly to separate from saidair stream dust-collecting liquid entrained therein durng the passage of S3.d ar stream along said zig-zag course.

6. A11 "ar filtering apparatus comprising, a plurality of collecting sheets, each of said sheets having corrugations extending perpendcularly to the direction of the flow of air and other corrugations extending at an acute angle to the directi-on of fiow of air.

7. A filtering apparatus comprsing, a plurality of vertically disposed collecting platee, one portion of each of said plates bavng vertcally extending corrugations and an adjacent portion havng corrugations extending angularly upward from sad first-mentioned portion.

8. As a neW article of manu acture, a metallc sheet for use in filtering apparatus of the character rcferred to, the sad sheet bavng; impact faces extending in one direction and counter-current faces extending in a different direction.

9. Ametallic sheet for filtering apparatus having a pluralty of transverse corrugations at one portion, and at another portion a plurality of corrugations extending at an angle to the firstanentionel. corrugations.

In testimony whereof, I afix my signature.

VVILLY SELL. 

